ID   PHAA_SYNP6              Reviewed;         161 AA.
AC   P06112;
DT   01-JAN-1988, integrated into UniProtKB/Swiss-Prot.
DT   23-JAN-2007, sequence version 2.
DT   03-AUG-2022, entry version 134.
DE   RecName: Full=Allophycocyanin alpha chain;
GN   Name=apcA; OrderedLocusNames=syc1186_d;
OS   Synechococcus sp. (strain ATCC 27144 / PCC 6301 / SAUG 1402/1) (Anacystis
OS   nidulans).
OC   Bacteria; Cyanobacteria; Synechococcales; Synechococcaceae; Synechococcus.
OX   NCBI_TaxID=269084;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=3031427; DOI=10.1007/bf00338074;
RA   Houmard J., Mazel D., Moguet C., Bryant D.A., Tandeau de Marsac N.;
RT   "Organization and nucleotide sequence of genes encoding core components of
RT   the phycobilisomes from Synechococcus 6301.";
RL   Mol. Gen. Genet. 205:404-410(1986).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 27144 / PCC 6301 / SAUG 1402/1;
RX   PubMed=17211581; DOI=10.1007/s11120-006-9122-4;
RA   Sugita C., Ogata K., Shikata M., Jikuya H., Takano J., Furumichi M.,
RA   Kanehisa M., Omata T., Sugiura M., Sugita M.;
RT   "Complete nucleotide sequence of the freshwater unicellular cyanobacterium
RT   Synechococcus elongatus PCC 6301 chromosome: gene content and
RT   organization.";
RL   Photosyn. Res. 93:55-67(2007).
RN   [3]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA] OF 1-10.
RX   PubMed=1901865; DOI=10.1016/s0021-9258(20)89636-7;
RA   Capuano V., Braux A.-S., Tandeau de Marsac N., Houmard J.;
RT   "The 'anchor polypeptide' of cyanobacterial phycobilisomes. Molecular
RT   characterization of the Synechococcus sp. PCC 6301 apcE gene.";
RL   J. Biol. Chem. 266:7239-7247(1991).
CC   -!- FUNCTION: Light-harvesting photosynthetic bile pigment-protein from the
CC       phycobiliprotein complex. Allophycocyanin has a maximum absorption at
CC       approximately 650 nanometers.
CC   -!- SUBUNIT: Heterodimer of an alpha and a beta chain. {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000250};
CC       Peripheral membrane protein {ECO:0000250}; Cytoplasmic side
CC       {ECO:0000250}. Note=Forms the core of the phycobilisome. {ECO:0000250}.
CC   -!- PTM: Contains one covalently linked phycocyanobilin chromophore.
CC       {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the phycobiliprotein family. {ECO:0000305}.
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DR   EMBL; X04716; CAA28421.1; -; Genomic_DNA.
DR   EMBL; AP008231; BAD79376.1; -; Genomic_DNA.
DR   EMBL; X53425; CAA37515.1; -; Genomic_DNA.
DR   RefSeq; WP_011243498.1; NC_006576.1.
DR   AlphaFoldDB; P06112; -.
DR   SMR; P06112; -.
DR   STRING; 269084.syc1186_d; -.
DR   EnsemblBacteria; BAD79376; BAD79376; syc1186_d.
DR   KEGG; syc:syc1186_d; -.
DR   eggNOG; ENOG502Z7RG; Bacteria.
DR   OMA; GGQLFQK; -.
DR   Proteomes; UP000001175; Chromosome.
DR   GO; GO:0030089; C:phycobilisome; IEA:UniProtKB-KW.
DR   GO; GO:0031676; C:plasma membrane-derived thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-KW.
DR   Gene3D; 1.10.490.20; -; 1.
DR   InterPro; IPR009050; Globin-like_sf.
DR   InterPro; IPR012128; Phycobilisome_asu/bsu.
DR   InterPro; IPR038719; Phycobilisome_asu/bsu_sf.
DR   Pfam; PF00502; Phycobilisome; 1.
DR   PIRSF; PIRSF000081; Phycocyanin; 1.
DR   SUPFAM; SSF46458; SSF46458; 1.
PE   3: Inferred from homology;
KW   Antenna complex; Bile pigment; Chromophore; Electron transport; Membrane;
KW   Methylation; Photosynthesis; Phycobilisome; Thylakoid; Transport.
FT   INIT_MET        1
FT                   /note="Removed"
FT                   /evidence="ECO:0000250"
FT   CHAIN           2..161
FT                   /note="Allophycocyanin alpha chain"
FT                   /id="PRO_0000199076"
FT   BINDING         81
FT                   /ligand="(2R,3E)-phycocyanobilin"
FT                   /ligand_id="ChEBI:CHEBI:85275"
FT                   /note="covalent, via 1 link"
FT                   /evidence="ECO:0000250"
FT   MOD_RES         71
FT                   /note="N4-methylasparagine"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   161 AA;  17422 MW;  C59C08DF7AC78E67 CRC64;
     MSIVSKSIVN ADAEARYLSP GELERIKTFV VGGDRRLRIA QTIAESRERI VKQAGNQLFQ
     KRPDVVSPGG NAYGEDMTAT CLRDLDYYLR LVTYGVVSGD ITPIEEIGIV GVREMYKSLG
     TPIEAVAEGV RELKSAATAL LTGEDADEAG AYFDYVIGAL S